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Method for producing clamp plate through lignin adhesives

A lignin glue and adhesive technology, which is applied in lignin adhesives, wooden veneer joints, adhesives, etc., can solve the problems of poor quality adhesives, poor product quality, and affecting people's safety. Achieve the effects of superior moisture resistance, low production cost, and improved safety performance

Active Publication Date: 2015-03-25
莫明鑫
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] At the same time, the current plywood market competition is becoming increasingly fierce, and the price of adhesives, which are the main raw materials for plywood production, tends to be fixed. Therefore, the quality of products brought about by vicious competition is not up to standard, and the law enforcement and supervision are not strict, resulting in low quality adhesives. Customs and other issues are becoming more and more serious, seriously affecting people's safety

Method used

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  • Method for producing clamp plate through lignin adhesives
  • Method for producing clamp plate through lignin adhesives

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] The production process of the lignin adhesive is as follows: In order to reduce the cost of raw materials, the pulp black liquor pulped by the alkali cooking method using bagasse as raw material is processed to obtain lignin with a content of more than 85%, and 70wt% lignin is added to the lignin Sulfuric acid, after stirring evenly, heat up to 140-160°C, sulfonation reaction for 1-2 hours; through the central circulation tube evaporator, the circulation speed is 0.4m / s-0.5m / s, and the moisture content of the output is controlled to 30wt% , precipitation, filtered and dried to a water content of 15wt%; add phenol according to lignin:phenol 1:1 (weight ratio), control the temperature at 85-95°C, keep the temperature for 1 hour, and finally adjust the pH with 30wt% sodium hydroxide to 6.5-7.0; 40-60 parts of the obtained reactant; add 15-20 parts of potato starch; 1-5 parts of silane coupling agent; 8-15 parts of aliphatic polyurethane acrylate; 3-5 parts of polyisocyanate...

Embodiment 2

[0021] Select veneers of the same size to make 5 layers of plywood, and coat the veneer with the lignin adhesive prepared in Example 1, and the amount of glue applied is 250g / m 2 , pre-pressing, the conditions are: temperature: 100°C, pressure: 0.7Kpa, time: 0.6min / mm; hot pressing, the conditions are: temperature: 150°C, pressure: 0.8Kpa, time: 0.7min / mm; stacking maintenance, The specific method is as follows: at room temperature, set up the bonded plywood layer by layer with wooden strips, and the upper and lower layers of wooden strips are arranged in the shape of "well" for 28 hours; Low wood surface, polished wood surface, paste aluminum oxide wear-resistant paper on the wood surface, hot press at 170°C, pressure 2.0MPa, heat dissipation finishing, edge beating, that is.

Embodiment 3

[0023] Select veneers of the same size to make 7 layers of plywood, and coat the veneer with the lignin adhesive prepared in Example 1, and the amount of glue applied is 280g / m 2 , pre-pressing, the conditions are: temperature: 100°C, pressure: 0.8Kpa, time: 0.8min / mm; hot pressing, the conditions are: temperature: 150°C, pressure: 1.0Kpa, time: 0.9min / mm; stacking maintenance, The specific method is: at room temperature, set up the bonded plywood layer by layer with wooden strips, and the upper and lower layers of wooden strips are arranged in the shape of a "well" for 30 hours; Low wood surface, polished wood surface, paste aluminum oxide wear-resistant paper on the wood surface, hot press at 170°C, pressure 2.5MPa, heat dissipation finishing, beating, and you get it.

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Abstract

The invention discloses a method for producing a clamp plate through lignin adhesives. The clamp plate is formed by bonding at least three layers of single plates through the lignin adhesives. The method comprises the specific steps that single plate sorting, gluing, prepressing, hot pressing, stacking maintenance and aluminum oxide abrasion paper pasting are carried out; according to the prepressing condition, temperature ranges from 95 DEG C to 100 DEG C, pressure ranges from 0.5 Kpa to 0.8 Kpa, and time ranges from 0.5 min / mm to 0.8 min / mm; according to the hot pressing condition, temperature ranges from 140 DEG C to 150 DEG C, pressure ranges from 0.5 Kpa to 1 Kpa, and time ranges from 0.5 min / mm to 0.8 min / mm; according to the specific method of stacking maintenance, bonded clamp plates are erected through battens layer by layer, and the battens on the upper layers and the lower layers are arranged in the shape like a Chinese character 'jing'. The manufactured clamp plate has the good dampproof performance, and is not likely to bulge or deform when encountered water and affected by damp. The cost of the adhesives used per square meter is low, and good application and popularization value is achieved.

Description

technical field [0001] The invention relates to a method for producing wood-based panels, in particular to a method for producing plywood by using a lignin adhesive. Background technique [0002] Plywood, also known as plywood, is commonly known as thin core board in the industry. It is made of three or more layers of one-millimeter-thick veneer or multiple layers of one-millimeter veneer or thin plate glued by hot pressing. It is the most commonly used material for hand-made furniture. At present, the most commonly used adhesives for making splints are condensed aldehyde adhesives, such as urea-formaldehyde resins, modified urea-formaldehyde resins, phenolic resins and their modified products, etc. These adhesives use formaldehyde as the main raw material, which inevitably produces Formaldehyde, although low-formaldehyde adhesives are currently available, it is not easy to make each batch of products qualified. [0003] With the continuous development of society, consumer...

Claims

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Application Information

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IPC IPC(8): B27D1/08B32B37/12B32B37/06B32B37/10C09J197/00C09J103/02C09J175/14C08H7/00
CPCB27D1/08C08H6/00C08L2205/03C08L2205/035C09J11/06C09J197/005C08L3/02C08L75/14C08L83/04C08K5/521
Inventor 肖文飞王飞虎谢振能
Owner 莫明鑫
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